Slipper



FIG. 1 is a top and left front perspective view of a slipper showing my new design;

FIG. 2 is a top and right rear perspective view thereof;

FIG. 3 is a bottom and left rear perspective view thereof;

FIG. 4 is a bottom and right front perspective view thereof;

FIG. 5 is a top plan view thereof. 

The ornamental design for a slipper, substantially as shown. 